One Day Savior Recordings

unknown

One Eleven Records

USA

One Four Seven

unknown

One Haven Music

USA

One Hot Minute

unknown

One Hot Records

unknown

One Last Drink

unknown

One Legged Pup

unknown

One Little Indian

United-Kingdom

One Louder Records

United-Kingdom

One Man

unknown

One Records

unknown

One RPM

unknown

One Shot Records

unknown

One Stop

unknown

One Way Records

USA

One Way Records Inc

unknown

One World Communications

USA

OneC Records

United-Kingdom

Onefoot Records

USA

Oni Red Chords

unknown

Onion Records

unknown

Onival Musique

France

Onkel Tuka Records

unknown

Only Fit For The Bin Records ?

unknown

Only Lovers Left Alive

unknown

ONN

unknown

Onomania

unknown

Onomato Pop

unknown

Onsala

unknown

OO Records

unknown

Oompah Beat Records

unknown

Oops Baby Records

USA

Oorong Records

unknown

Oort Records

unknown

Opal Music

unknown

Opaline

unknown

Opaline Records

unknown

Opci

unknown

Open House Records

unknown

Open Mouth

USA

Open Road Recordings

unknown

Open Sky Records

Ireland

Open Your Eyes

unknown

Opendisc

unknown

Operation Seraphim

unknown

Ophidian

unknown

Opio Media

unknown

Opium Eyes Records

unknown

OPOS Records

unknown

ÖppåHåppa Records

unknown

Opposite Productions

unknown

Oppressed Records

unknown

Optical Sound

France

Optimo Singles Club

unknown

Optimus Discos

unknown

Opus

unknown

Opus 3 Records

Sweden

Oraculo Records

Spain

Orange Music

unknown

Orange Recordings

Canada

Orange Records

unknown

Orange Twin Records

unknown

Oranje Records

unknown

Orbeat Music

Brazil

Orbison Records

unknown

Orbital Productions

unknown

Orchard

unknown

Orchid Tapes

unknown

Orden Productions

unknown

Oreade Music

unknown

Orfeo (ARG)

Argentina

Orfeo (URU)

Uruguay

Orfeu

Portugal

ORG Music

USA

Org Records

unknown

Origami Records

USA

Original Master Series

unknown

Original Signal Recordings

USA

Original Sound Entertainment

unknown

Origo Sound

Norway

Ork Records

unknown

Orleans

unknown

Orphanage Records

unknown

Orpheus Records

unknown

Orphic

unknown

Os Filhos Do Rock

Portugal

OS Music

unknown

Oscar Records

Poland

OSCL

Australia

Osk Records

unknown

Oskar

Poland

Otdelenie Vykhod

unknown

OTF Records

USA

Other Music Recording Co.

unknown

Other Peoples Music

unknown

Other Tongues

unknown

Other Voices Records

unknown

Otorecords

unknown

Ottersong

unknown